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AD9910 Recommended for New Designs
The AD9910 is a direct digital synthesizer (DDS) featuring an integrated 14-bit DAC and supporting sample rates up to 1 GSPS. The AD9910 employs an advanced...
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AD9910 DRG Mode – Frequency Sweep with Multiple Exclusion Bands and No Dwell Time

		
	
				

			

									
					    suyogchoudhari1
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jun 4, 2026 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user asked if the AD9910 DDS can implement a continuous frequency sweep with multiple exclusion bands using DRG mode. The final answer states that the AD9910 DRG cannot skip frequency bands, but recommends using RAM mode to pre-load frequencies, skipping the exclusion bands, and using an external controller for real-time changes. No additional application notes or example designs were provided.
                        	    

                
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Hello,


We are using the AD9910 DDS and plan to implement a frequency sweep using the Digital Ramp Generator (DRG).


Our application requires a continuous sweep from 20 MHz to 100 MHz, but within this sweep there are several frequency bands where the output power must remain low (or the frequencies should effectively be skipped). The exclusion bands are:


    

  • 30 MHz – 35 MHz
    • 

  • 50 MHz – 60 MHz
    • 

  • 70 MHz – 75 MHz
    • 

  • 85 MHz – 90 MHz
    • 



The desired sweep profile is therefore:


20–30 MHz → 35–50 MHz → 60–70 MHz → 75–85 MHz → 90–100 MHz. These bands will change in real-time.


Our objective is to perform this sweep without introducing any additional time delay or dwell time at the boundaries of these exclusion bands.


We would like to know:


    

  1. Is it possible to implement multiple exclusion bands directly using DRG mode?
    2. 

  2. Can the DRG automatically jump across specified frequency ranges while maintaining a continuous sweep timing?
    3. 

  3. If not, what is the recommended approach to achieve this behavior on the AD9910?
    4. 

  4. Are there any application notes or example designs that demonstrate a sweep with multiple frequency gaps?
    5. 



Any guidance would be appreciated.


Thank you.

			

			
									
		                             
                        

    

                                            
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 20, 2026 3:22 AM
            
            
						
			            		
    
		
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    Hi  ,
    

    Apologies for responding late. I have been getting problems with the notifications and this is one of them. I have been trying to answer all unreplied threads. 
    

    To answer your question, no. The AD9910's DRG cannot skip frequency bands, it only sweeps linearly between two limits.
    

    An alternative would be to use RAM mode.
     
    Pre-load only the frequencies you want into the AD9910's 1024-word RAM (skipping the exclusion bands). Playback is continuous with no gaps in timing, the output jumps instantly past excluded frequencies.
     
    If exclusion bands change in real-time: Use the parallel data port with an external controller (FPGA/MCU) that feeds frequency words on-the-fly, skipping bands in your control logic.
    

    All the best,
    

    Jules
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 20, 2026 3:22 AM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hi  ,
    

    Apologies for responding late. I have been getting problems with the notifications and this is one of them. I have been trying to answer all unreplied threads. 
    

    To answer your question, no. The AD9910's DRG cannot skip frequency bands, it only sweeps linearly between two limits.
    

    An alternative would be to use RAM mode.
     
    Pre-load only the frequencies you want into the AD9910's 1024-word RAM (skipping the exclusion bands). Playback is continuous with no gaps in timing, the output jumps instantly past excluded frequencies.
     
    If exclusion bands change in real-time: Use the parallel data port with an external controller (FPGA/MCU) that feeds frequency words on-the-fly, skipping bands in your control logic.
    

    All the best,
    

    Jules
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

    • 





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